Abstract
The effects of sea salt concluded in oceanic atmosphere are ubiquitous in practical wireless optical links. Here a shore-to-reef atmospheric continuous-variable quantum key distribution (CVQKD) model is established on the basis of Mie scattering theory, with the aim to characterize the complex case of beam propagation in the atmosphere caused by sea salt particles. The effects on performance of shore-to-reef atmospheric CVQKD under the sea salt particles and relative humidity are also studied. Simulation results show that the increase of particle radius and relative humidity will lead to the degeneration of secret key rate. Extending the channel distance also reduces the secret key rate. This paper provides a basis for the establishment of practical shore-to-reef atmospheric CVQKD model. The research of this paper also gives momentous reference for the study of optical communication channel models with other suspended particles over the ocean.
Highlights
The purpose of this paper is to obtain a model of shore-to-reef atmospheric channel continuous-variable quantum key distribution (CVQKD) via exploring the atmospheric attenuation caused by suspended sea salt particles
It is momentous to study the effect of sea salt on the performance of atmospheric channel CVQKD, which ensures the normal implementation of the protocol in high concentration of sea salt atmospheric environment
The purpose of this paper is to analyze the effects of size of sea salt particles and relative humidity on ocean atmospheric CVQKD
Summary
There is no complete study on the effect of sea salt on atmospheric continuous-variable quantum key distribution (CVQKD). The purpose of this paper is to obtain a model of shore-to-reef atmospheric channel CVQKD via exploring the atmospheric attenuation caused by suspended sea salt particles. It is momentous to study the effect of sea salt on the performance of atmospheric channel CVQKD, which ensures the normal implementation of the protocol in high concentration of sea salt atmospheric environment. The extinction effect caused by absorption and scattering of beam by sea salt particles is the main factor affecting the quantum transmission with the large concentration of sea salt. The research hopes to provide theoretical basis and evaluation support for the implementation of atmospheric channel CVQKD protocol in high concentration of sea salt environment.
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